Related Party Transactions - Transactions with the Relief Fund (Details) - Cantor Fitzgerald Relief Fund - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2015
Related Party Transaction [Line Items]
Additional expense and associated liability	$ 9,200,000	$ 8,300,000
Charitable contributions, additional expense recognized	6,400,000	7,200,000
Accounts Payable and Accrued Liabilities
Related Party Transaction [Line Items]
Remaining charitable contributions	$ 0	$ 1,700,000
Other Expenses
Related Party Transaction [Line Items]
Charitable contributions			$ 40,000,000